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How-To Geek

Multitasking on the command-line can be really confusing for beginners who use Screen. Using Byobu puts a host of system stats available at a glance while making it easy for newbies to work without memorizing hard-to-remember keybindings.

Screen vs Byobu

Byobu is an enhancement that connects to and uses Screen, but offers useful statistics and easy-to-use hotkeys for the basic commands. For reference, here’s Screen:

GNU Screen by default doesn’t give you anything to find your bearing, but by editing the .screenrc file, you can add a “hardstatus” line like in the above screenshot. You can see the machine name in the bottom left, and some date and time on the bottom right. The middle shows you how many shells are open and which is active.

On the other hand, here’s the default Byobu screen:

And yes, that’s the default. You’ll see the open shells and a host of other stats, such as uptime, core clock speed, CPU load, memory use, network speeds, packages in need of updating, and so on. You can change the colors you want and the options you like, too.

Installation and Customization

In order to use Byobu, you also need to install Screen. We can use a simple terminal command to install both.

sudo apt-get install screen byobu

Enter your password and hit “y” if prompted for confirmation. Next, it’s time for easy customization.

You launch Byobu by just typing it into the command line.

byobu

If you want to use options for Screen, you can just plug them in and it’ll pass them along. Here, we’ll use the –S (capital ‘S’) option to give the session a title.

byobu –S session_title

You can also resume sessions by using the –r flag.

byobu –r

Or you can resume by name:

byobu –r session_title

You’ll see the default screen. To begin customizing, hit the F9 key.

Jump down to “Toggle status notifications” to change what shows up at the bottom.

You can also make Byobu launch by default whenever you connect/login.

You can also change the background and foreground colors if you like.

Hotkeys

You can use all of Screen’s default hotkeys without a second glance. However, Byobu has easier keybindings that utilize the function keys:

F2: Create a new window

F3: Move to previous window

F4: Move to next window

F5: Reload profile

F6: Detach from this session

F7: Enter copy/scrollback mode

F8: Re-title a window

F9: Configuration Menu, can also be summoned by Ctrl+a, Ctrl+@

As you can see, this is much easier than using Screen’s Ctrl+a,Ctrl sequences. If you prefer Screen’s keybinding set or if they interfere with another program (like Midnight Commander), then you can switch from using the function keys to Screen-style keys in the menu, or hit by hitting the following key sequence:

Ctrl+a, ctrl+!

PuTTY

If you’re using PuTTY or KiTTY, then there’s just one last step you’ll need to take. The F keys may not work properly at first, but it’s an easy fix.

Under the Keyboard options, you’ll have to change the Function keypad settings to “Xterm R6.” Now you’re set to enjoy Byobu via SSH!

DID YOU KNOW?

In the movie Toy Story, the toolbox used to trap Woody beneath a milk crate is labeled Binford Tools–a nod to the fictional tool company featured in the show Home Improvement, a show headlined by the voice of Buzz, Tim Allen.